Using Regular Expressions in Segments Piwik 2.8.3.1

Is it possible to use segments in segments - I want to match a list of different regions

I thought about using an OR statement in the New Segment wizard but get nonsensical data back. For instance when I create a segment where Region = region1 OR where Region = region2 I get zero data back. I have noticed this before when I have tried to combine different dimensions in a segment.

I would much rather be able to sue regex as this would be much more powerful.